Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0c9c92d4b39ae7f7144e85a659538c726471dd0f640d1fac6f61497e0e7bf0' 
  AND token = 'DWywPvIXP5c4CkogBkIQJMqeb4+jp2gVNceSm9Y6bmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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