Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb4362fc946debe4451b876cc7ea0764c666802fe85a10754e6a695fe4cb8a78' 
  AND token = 'Jrg67CuIjEyUrx5+FVwDeEmakUuNOXAEnhBGyKKI2jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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