Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85d8d3cfbecb7385c8f483a43d18935d2b69294a3cdae825cf63c438b425d75e' 
  AND token = 'sYXD2PfkCQz7rr+iy75ftcd2tZ2kbIAaiCDSViBgdxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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