Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6539f89c8d11db956f020f05bee18dee7da459465c2cd9babd4829d65216a872' 
  AND token = '8fwSkswfhU4bk863PdC4v0HTjkxpFMDXBaOZiqffb9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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