Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff3c752a9f38dbe0f9cb9f5c78c66e9a4aa5dbb19aece71f2056035efaff2da' 
  AND token = '6xtM6sVrzAShjuy/vM9T4DtPD2roJd4ScI5ksT4ZyK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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