Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2387b067a1c1c0a499dbd0f3145e8d384f45c0edd469eaaf2c6346e8faa8947' 
  AND token = 'uf9txajv2dgh99JnZ57Ams8pX+uiBGSU7mcGCPrxuKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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