Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1b33d974d021ffad938b4d039753f395370e8d14b47b4321041574047bb581' 
  AND token = 'WCU9VPjyCx8TrP/tWWdgdF1d/4m5s0N+eXEzfDd4BCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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