Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d385794f8365e41680d261da88c3917506d1c05a0500ba572e2ed1767ea9f5' 
  AND token = '6HBko5wX/Wvqu6U0ohUFgud43bl5AzK4otGjU55njN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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