Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe9d6a5feb3334edbdd35592d989a5b1ca9fcb040f12d2b93a94d68eca5a423' 
  AND token = 'SegLUa+XMU1w/Ubk7IcRV4XpM/9OP2FDThJQyFwbiLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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