Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc8d648679e43f7fd847d28e5b2db2c72bcb351689c84b7bcdf1087ab456fa9' 
  AND token = 'm7ZetbUtpaI/Fa1ZkGZAx9podt1JIRcDyrf0L551tSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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