Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa3be5b333d1b08d200ccd365e55b1adeb4a42c929c6778a79482cb078baa4c' 
  AND token = 'lYHXo5iB4STRJ+Z6Uho2hQoSGRBzscfU2EwYw3t0abY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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