Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a02498aca4bfc2cd7235bf991f56dae9c96d96d76d6e78cadbb5e4e15d0ec57' 
  AND token = 'BsEMrAlwDIrzBZ8tE/4bDvwIDqYcP2ZMlEIJ7OU15AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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