Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8790a85bdfc7104ed4de7fe0ec6a106a6c4827c1d161f08a2ad738d36573b74' 
  AND token = 'X5SdHfWygNCEsMdx2e9Bo0Y+OVMEp3sVhd6xbu8+vc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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