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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c6a36c240a57cda602953ed5254ebb1bb7f0ca1a226d496d28a24347bbef8c60' 
  AND token = 'D9sl4ppXcwaNsErTIEtTd2O2x+3xn3bVCCEV5nlz63g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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