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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f9e8ca3db3497894b9f9e4c66f25718e3c9b7929dedda1ebec9cd288d10bbe35' 
  AND token = '3CRsQEuYtHtVNb+IXBEDpgXXsE44Vu/eXZsZ7W5gOOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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