Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298f36e633f152f3a58eb7421d1fbd8fc9f6420b220a16c72bca0c739cbb151b' 
  AND token = '6pTLeYHBH2P/anBl1ObRP3WhpbeDfVeTVgIOaCGvOWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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