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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ddc071526a04375473bb5b22dd928c668474e3b25a3624a7f01cf57688e33fc' 
  AND token = '1dvlcLCApIK2/pF4yEWYYWnSTweOsQogJ4ktE3XnOjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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