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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'afc2ef2d8fcdb6487bf034061c209e2736a81043f4f238eed3497e2063fdb262' 
  AND token = 'LU0Z3N9kqVO9m7VkiQSXGg67f0S45K06aww9cg3j1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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