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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '598a4c13737ca6545c5add6def6c9aec1cc155fdaf77b55bf97fcfece9cfc2ac' 
  AND token = 'XrBhzB9wv/lbm0nwUM5Oc5JciTRB31Lx0/UcUrG9wcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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