Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbffe99e4fb235e5de7618187dd7e01807ce828a2fee824d33772a2557c91fe3' 
  AND token = '+rDjwffehnw1iBv/ZCx4SGpCL8afCDEt2YkqujbE7Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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