Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2cee2bf045c7e20fab97029f0dd2884266be3cac73023576c4049cad05968d' 
  AND token = 'XhluSxqAu9XfDHHiByvkB9ri2Wz4e8E9ugGoDvI2238=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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