Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329807bb86ad27742b2ef8ff27369f35031582628bf5bd482f3d2090d2ce233b' 
  AND token = 'N4+/5T6ZQw8kKQW9lYMP+AgU5R0f4Dh+nF0iZbCE3Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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