Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14a0b7e977485492231098ccdfe9fdb0170aad3e7bdd10c4ea1d244cee30813' 
  AND token = 'ebPdq2Kg6ggUXnR/6YbJYgcAPrdBm2zjANphoySR/AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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