Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6055c250295b3557a11e991461bf3b4ea11d2a6d36a27143b7da60cfe952cae' 
  AND token = 'TtzVcB1B9zLc9T6DLUB+bxrLWTVzkzfo/mCcVPIXWVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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