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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ac4de2c65840d761ade64c7d6b0adb85f3c2f376bab120ed58571a040d525298' 
  AND token = 'uUG2Zpj9xan8JqF7163OnV6we+3O47ovmehAeBLp0d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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