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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3cf11a79e9f403047471848ca4ede319ddfad954cab6282344f2b1c4e5284979' 
  AND token = '2AbkEZMYr8FQQ8MRr+DggGaWsFph9KI7+KrSn5leME8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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