Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7281947fa83dd57f857e9ecf66ad79d96ea21bbebde9678ef83a1e59172dbbcf' 
  AND token = 'MmRTrJ5oet4sMNmYZn/eHpHdPEaUPy6jSQvRcAv49Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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