Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f548ca124554f98afcae9448ead8fa140b73232681dba7b4052ac035611ace' 
  AND token = 'BLmvD1YSoFkbQwLn/392BHTQRoMgr2PFkXt8oqdj2Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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