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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c63bc15d5cb8d1fdeb96be7d483bcae688dd5a594ee41ecec8ad4afc5ecdc1d0' 
  AND token = 'r9bJt8YU3K9snF3mGNG5FSYWriuiJ5vauFL/0HYL5yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00296

JSON explain

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