Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a752304cdf8469b32d03c97af3b87ed753f93768099a742b96cfb356a8ab3c1c' 
  AND token = 'CVmEXSu4vS+4TZ+CyNYRncBoTLcXI41e0cw9SaCqQug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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