Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '751d128a33b2f649d24407aa1ad4bba478f7c442d7000e5e7ad49bd68dc3a1f3' 
  AND token = 'ZSCMjp4X0chv0rDn2BDNmnAL5NqoQrTc7LezSCLqMcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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