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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4fdbf5061073e5a25fee6f3776d7952b64b8ab4bf79297525cd99d32c7211f43' 
  AND token = 'Vu233B/HuQ1pU9zxUU2qx3fiaQ/TnLqHDogEQfUdlj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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