Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5dbe0123dc55bf442ea1946a235e9076e5f411f85ea119868ee2a777d78953' 
  AND token = '8fnPlRwdSRuME8zkGwtZPykw3UMXWFtUUy+wSsHB9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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