SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89c0a083e04624c922a74924ec87959bb01fb395dc0d3555607df23deb6da07d' 
  AND token = 'B6gwqFztGbPJ3nXT6hcDYXtKpFb7BjeStb4Pafl9xTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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