Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f6d9db2ee5efa76479ad1e3f01d6571d576dba5d7ca241f38ebdad0e3d2bb2c' 
  AND token = 'IdSMdNRojez5ITvwF9/HDgvgH7eyrWC9zhAPkJ2GpU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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