Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3d027e313c7201944126929052c85dd0933c087e876f868bd163cdda1fa09c' 
  AND token = 'RlqudcMEJLoluuFlLdWlP+YOwmX9CsBSmt+aqZvG5kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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