Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93ea200f725000e42818541e0b735589591bedcb25f4ca7e0217b629c54d47d' 
  AND token = 'vBjLKJMxt8xy+MbIClb3x/lvk+BER+m9+BypYntlSbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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