Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d67e8f3a307d5338f6766fa88e670579b9ee981963d6b6476755d12ff5901f' 
  AND token = '3S2ey8l9ezX54lSur39jiIdSJj/9H9K/+BsAOSFe22o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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