Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1adf7834d2bb27d65f5c90e021bf0dd20a3f62f0372ee034004f306b9be7450' 
  AND token = 'TUN2osIQkLK7a+gcq8BNIrPi+EJMI3wDFNoI4iuok10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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