Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326f6bbbcd740aeea6e91914feef12ff00844943b051023acf6253816e1edf9c' 
  AND token = 'JdATHpk5M3nIG2etUzZrI+gIlMoJPhdMmLicRn0NFww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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