Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad3d37a499f78f53c80b6b23bc08828c99e9818f7cd3911add239eead8641be' 
  AND token = 'Oojsgp3K5oSs7MMMbra9uMZuPoyAXGwTSnwKPmzq4NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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