Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ad3bd47ce9e4c80c72dd139ef1a5e1430cd0a667feef7540f8dde40eef1b3e' 
  AND token = 'QB5X7esm38bzyzpA0aZPQx/Dasx3V5HdYBXXpGU6NXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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