Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0e718febbe0cd717d656ef6751799ae1a4799d2ef435c7851311b07bd75fd2' 
  AND token = '6If45KMczYRWjoCPU4k4eVQrKhvm8LN1yv1D+EbBQD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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