SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63713193c30fb98b1ff0340dfd33d9f186e7eb33a678c625ac352be87efe13d4' 
  AND token = 'g9+ctX2fODCr4iBqp+okJIoGw+9yCVIGp+sf1nZWbBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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