Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91bcb5aabb93db77c43df5c4b135324c5a1932a68a5532b63d92eb74f78c5e3' 
  AND token = 'kkzq58i3LMRhLfh1zf7dsJQ1tR6H+6nqVz5/TxhSpX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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