Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5c4acb7722315e2466d94c757c11fdcbaeb0d43be35d28e7ed2a96198e76af' 
  AND token = 'nn5CB9VOL3v1yTa+lzPIlqS2FFxjTGOR7iV+YvYT6vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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