Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e2fb5feb47cad59b91527452f1d576691b5168fd71e4b09faf65e0c3fa444e' 
  AND token = 'RkbJQFUaTXm5krpXGZTCdr9eY0xOGhrBUEZlPQ0jhaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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