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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd468ba6aa8ac849a8a95d4616b1fe01eed35a1762e426027035a4b5a59032dea' 
  AND token = 'V2eAePxyzgtPebZOwiNWYkL1KhzBT1SO34+UjbnthLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}