Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d516ffd5b632afd5052055c55665759ccf53f7d82233bd0b7e245d764eaec28' 
  AND token = '6laOAGm2c1cLLlIlcrVs9RlY93xIxR+HaGcAtZV2f9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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