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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44d79afed25ab626055a42646a83983bc1df9ed8d261d2254a6e32d71349e516' 
  AND token = 'FgYMYxweiI00l3qnn66pU0/ycP9hUtUqJHIPCKCh/DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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