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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c724907c441654c55aac61187fa14be3086c9cca8327b12be2d6fec29735a94' 
  AND token = 'APAENUDTc2MEM7gnKBhcQA0dlV1BwogOUARqJtukwf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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