Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74678c91d8e6ee505340aedd1bb5ac08d252350d33944e5765c1a49132684dd' 
  AND token = 'xLfFnXPuu3Ti8OBsLaNeHNRYLaClYIkcrR4Mb0fgmEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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