Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddca10cfe02a3e7f289832df71b0a73289c2cbe93ca78645371c46b00d6969da' 
  AND token = '+MXfe+Yzar2KUMu70EZJZ0qNSqL6QXHDRPW3UoR5Dqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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