Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d28c4ca7dbb5973432f5f3af814f21ee0eb49574b28cc15533539b959bd9b73' 
  AND token = '6joxcb0XvaqyQKq3HEgY81YC6fi4NcDC/60ApjoCaKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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