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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a672f3b0a5444dbcdc0847137743e2e362615efefec1bf69bc83d6b2763d5b4d' 
  AND token = 'nqQNhoaHw6a7nELmwx5Hm4u6G7w04KSIwWqzA/X7rFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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