Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4900829464c8abff4b6da5bdfd82de957321ff2d44cf749b22e4adcc510da9e' 
  AND token = '5NUMYReqkydSyOFx3GQnT3JHNJB4Sfmi2+khEig0NC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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