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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ffd9a69a06973cb3fac8d604008131e37f0610239bc039183dab62fe84a9d40' 
  AND token = 'mHbx/7y0TQGo30/KYtqkeooFsbcI/pRH/9W/NUF33uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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