Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f97050db37dc0310c66d6b947d2dd1e01574ea5ff8ac5c5dae459ad3e3d5ee' 
  AND token = 'RAE4K7reHUW+FiNrJtind8r6XxzET+AattbcdGUGvgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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