Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15f50ffb74eb044270a3dafd7eeb996596c0c8d6aa357751dfa4401653e0bbb' 
  AND token = 'OLmnhaNwcYr9YC5p3px3n/UIrDpoSdR2mdfA+0B79Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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