SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e05e15db77eebba3537993be8f54f5ceb639e2a3aa0fd66f8c328cef77211004' 
  AND token = 'nY7i0rzKaVGNwBQCdL2+wpyFxEJuL8tNRNVDBDuyzjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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